CN1685655B - Device and method for detecting a useful signal by detecting a periodic signal - Google Patents
Device and method for detecting a useful signal by detecting a periodic signal Download PDFInfo
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- CN1685655B CN1685655B CN03823100.XA CN03823100A CN1685655B CN 1685655 B CN1685655 B CN 1685655B CN 03823100 A CN03823100 A CN 03823100A CN 1685655 B CN1685655 B CN 1685655B
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- 230000003111 delayed effect Effects 0.000 claims description 4
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- 238000000926 separation method Methods 0.000 claims description 2
- 238000012937 correction Methods 0.000 description 11
- 238000005070 sampling Methods 0.000 description 9
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Abstract
A device for identifying a useful signal by detecting a periodic signal contained in the useful signal comprises a correlation unit (24) for correlating the signal with the sign of the signal while taking a time delay into consideration. The inventive device also comprises an amplitude estimation unit (21) for estimating the amplitude of the signal and comprises a decision unit (14), which is connected down from the amplitude estimation unit (21) and from the correlation unit (24), in order to decide whether the periodic signal is present.
Description
Technical field
The present invention and the one-period signal and to detect the apparatus and method of useful signal relevant that is contained in useful signal by detection.
Background technology
So far, per second up to the data transmission speed of 54M bits to be implemented in the WLAN. and such specification can be at " IEEE 802.11a part 11:Wireless LANMedium Access Control (MAC) and Physical Layer (PHY) specifications:High-speed physical Layer in the 5GHZ band " and at " IEEE 802.11b part 11:Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications:Further HighSpeed physical Layer Extension in the 2.4GHz Band " or also can be at " ETSI TS 1-1 761-1 Broadband Radio Access Network (BRAN); Hiperlan Type 2:Physical (PHY) Layer " the middle discovery.In order to detect a useful signal; Must find the one-period signal that when a bursts of data of useful signal begins, is transmitted out.
Fig. 1 represents a time-histories figure, and one-period in the cycle signal u (t) that wherein has a definition since a specific time to one assorted letter signal n (t) takes place simultaneously.X axle on this figure is the unit interval of a sampling period, the index of just taking a sample, and what drawn along the y axle then is the amplitude that is comprising all signal r (t) of assorted letter signal n (t) and periodic signal u (t).The generation that described periodic signal u (t) is superimposed upon assorted letter signal n (t) must detect by a signal detector.If described signal detector operation is errorless, so at time t
0The time be bound to can not find periodic signal u (t).And the possibility of the error detection of described periodic signal u (t) must not take place in this cycle as much as possible.On the other hand, in case described periodic signal u (t) at time t
0Shi Fasheng, described signal detector is the existence of proving period signal as far as possible apace.Such error rate also should reduce as much as possible.Described cyclical signal u (t), and useful signal therefore should, for example verify with 90% probability within the time of 4 μ s.
Fig. 2 represents a kind of possible application of such signal detector.The described analog mixed-signal r (t) that comprises assorted letter signal n (t) and may comprise periodic signal u (t) has the amplifier of automatic gain control 1 by one and amplifies and be fed to the transducer 2 of an analog/digital.And the complex digital signal s (t) that can collect from the output of described analog/digital converter 2 is fed to described signal detector 3.In addition, described signal s (t) is fed to a receiver 4.Described signal detector 3 sees through the described receiver of a signalisation that appears at detector output DA and whether detects one-period property signal.
Because described amplifier with automatic gain control (AGC) 1 has changed gross power, therefore the change of the power of a pilot signal s (t) is to be used for sense cycle signal u (t).Amplifier with automatic gain control 1 makes signal gain can be adapted to needs from the time to another time.For this purpose, described power can be in the input fluctuation of described analog/digital converter 2, thereby also in the input DE of this signal detector 3 fluctuation, this also is why whether can't provide appearance that reliable information verifies this periodic signal u (t) in the variable power of the described signal s of input (t).
Fig. 3 is illustrated in that the defined data that are used for transmit and are used for synchronized outburst structure between conveyer and transmitter in the foregoing IEEE specification.Described outburst structure is being begun by the preface STP that short training sequence was developed, and described preface STP also is referred to as PLCP preface or OFDM training structure.The signal (short training sequence) that one 0.8 μ s are long is called t in Fig. 3
1, in STP, in the time of whole 8 μ s, repeat 10 times.In Fig. 3, these repeat with t
2, t
3, t
4..., t
10Represent.Be right after the back then be by a guard at interval (Guard Interval, GI2) and two preface LTP that training sequence T1 and T2 are developed.LTP also is extended to the time of whole 8 μ s.Because LTP and the outburst section signal that is right after after LTP, data 1, data 2 all are unessential in this case, therefore will describe in detail no longer further in the article below.About finding in 17.3 joints of such detailed description in can the specifications of described in front IEEE 802.11a.
In order to detect a outburst, the periodic signal t of described preface STP at receiver terminal
1, t
2, t
3..., t
10Brought use.In order to detect the periodic signal in signal s (t), can utilize described periodic signal t
1, t
2, t
3..., t
10During according to the translation of this signal period to similitude itself.And do not having under the situation of periodic signal, described signal s (t) also would not show any periodicity.
In described in front second piece of background document ETSI specifications, different a little about the definition of training sequence, but the periodicity of periodic signal then can here show equally.The list of references here please refer to the 5.7th and 5.8 joints.For this reason, the periodic signal that is superimposed upon on the assorted letter signal also can detect under the situation of these specifications in the same way.
Fig. 4 represents four signal t that the mode of a time-histories figure is represented
1To t
4The real part 4.1 and imaginary part 4.2 of sum total, wherein, the sampling index is arranged along the x axle, the arbitrary unit of an amplitude then is along the y axle.Sampling rate among the figure is 20MHz, and just 16 sampling points correspond to the repetition period (0.8 μ s) of periodic signal u (t).In Fig. 4, four signal t of described periodic signal u (t)
1To t
4Should be detected next by signal detector 3.
From previous technology " VLSI Implementation of IEEE 802.11a PhysicalLayer, L.Scwoerer, H.Wirz, Nokia Research Center, 6
ThInternational OFDM Workshop 2001-Hamburg, pages 28-1 to 28-4 " in, a signal detector utilizes following automatic calibration function to come the sense cycle signal to know:
Wherein, τ is the one-period of periodic signal u (t), and T is integration or totalling cycle.Period tau can be described repetition period (0.8 μ s) or its multiple, just τ=0.8 μ s or 1.6 μ s or 2.4 μ s etc.
Fig. 5 represents two time-histories figure, and wherein in each example, the sampling index is arranged along the x axle, and amplitude then is to arrange along the y axle.The compound digital signal s (t) of icon representation of top.When sampling index 20, periodic signal u (t) appears.And below icon in, automatic calibration function c in the equation as previously described (1)
1(t) be shown among the figure.Signal s (t) does not comprise an assorted letter signal in this situation.Integration or totalling period T then are 0.8 μ s.At 1.6 μ s (corresponding 32 sampling points) afterwards, the last 0.8 μ s of described signal s (t) ideally is associated with the initial 0.8 μ s of described signal s (t), and after periodic signal takes place, the 1.6 μ s that described sum total from dynamic(al) correction still remains unchanged.
Also represent two time-histories figure in Fig. 6, wherein Shang Fang time-histories figure represents signal s (t) equally, and the time-histories figure of below represents automatic calibration function c equally
1(t).Sampling frequency maintains 20MHz equally but signal s (t) described here presents an assorted letter composition.The automatic calibration function c here
1(t) no longer stable.In addition, described automatic calibration function c
1(t) also begin to depart from numerical value 0, very before taking place, just begin to depart from periodic signal.In order to detect described periodic signal reliably, a threshold value must be considered into.If described automatic calibration function c
1(t) surpass described threshold value, so just assume described periodic signal and occur.Described threshold value is high more, according to foregoing function c
1(t) probability that detects the one-period signal low more automatically corrected error.Yet the result of the high like this threshold value of use tends to expend described periodic signal and detects many times before.
Described from dynamic(al) correction c
1(t) also relevant with the power of described signal s (t).Therefore, described this threshold value must be complementary with described signal power.The mean value of the power of described signal s (t) is not constant, output signal is maintained within the interval with attempt because described variable gain amplifier 1 is arranged on the upstream end of described signal detector 3.And to do like this be necessary, to avoid described analog/digital converter 2 situation of overload takes place.Even and input signal r (t) as shown in Figure 2 presents a constant average power, wanting to set described variable gain amplifier is impossible to described correction numerical value immediately.At first need through a series of adjustment.Because the variation of gain, under any circumstance, at the average power of the signal s (t) of the input of described signal detector 3 be bound to fluctuate (fluctuation).When also adding the described periodic signal of being taken in here and be detected and described useful signal when being received, only set a fixing end value on described change gain amplifier 1 is normal.For this reason, described power must be estimated in the process that detects.In the prior art, equation what follows is the power that is used for estimating described signal s (t):
Described power p (t) is detected in the time of second above last T employed signal s's (t) during dynamic(al) correction.During this process, must annotate what want is described inhibit signal s from dynamic(al) correction (t-τ) and not exclusively with reference to its power, shown in equation (2).For this reason, a variation when described amplifier gain can't be detected immediately determines by adjusting described threshold value fully.
About a preferred methods of this part for estimating the described signal component power of (comprise described signal s (t) and described inhibit signal s (t-τ),, solve the root of this product subsequently) together earlier with they mutual products.Yet this will cause the manner of execution of an obvious higher cost unfriendly.
The judgement that whether occurs for described periodic signal decides by following situation:
c
1(t)≥p(t)*thr (3)
Wherein, thr represents described threshold value from dynamic(al) correction (not being subjected to Power Limitation).If described c
1(t), be the hypothesis of one-period signal appearance greater than the product of described power of equal and threshold value thr.
The value of described threshold value thr is a high-reliability of wanting periodic signal to detect, and on the other hand, possible one compromise of the fast detecting of periodic signal.
Block diagram is as shown in Figure 7 represented the configuration of a signal detector 3, its be used for carrying out by in the foregoing prior art the concrete equation of implementing.Wherein thick line is represented complex signal and fine rule is represented real number signal.
As have an input DE at the signal detector 3 as shown in the block diagram of Fig. 7, present an input signal there, and the plural digital output signal of a described input signal that is a contrast/digital quantizer 2.Described input signal s (t) is fed to the unit 13 in order to the power estimation, provides the described power budget signal p (t) that is calculated according to equation (2) with the output at it.For this purpose, described unit 13 in order to power estimation has a unit in order to a quantity 5 in addition square, and has a contrast adder 6.Simultaneously, described signal s (t) is fed to an automatic correlation unit 15.Described automatic correlation unit 15 comprises a unit 9, in order to form the complex signal of conjugation, a delay cell is in order to τ during described signal s (t) delay is described, and a multiplier 16, in order to described signal s (t) is multiplied by described delay complex conjugate signal s* (t-τ).After described multiplier 16, setting be to have the adder 11 of a simulation that increases period T and in order to produce the unit 12 of absolute value.The output of described automatic correlation unit 15 is connected to one first input of a decision unit 14.Described thr appears in one second input in described decision unit 14.One the 3rd input of described decision unit 14 is connected to the unit 13 in order to power budget.Described threshold value thr adjusts by multiplier 7.Check via a comparator 8 according to the described threshold value of equation (3).At the output DA of described signal detector 3, a detector signal d (t) can obtain whether to detect the one-period signal to offer some clarification on.
The objective of the invention is to describe in detail a device and a method that is used for detecting the one-period signal, and under the possible performance of budget of minimum, detect the one-period signal reliably, apace.Especially, the Strength Changes of input signal can not cause very big influence to the reliability that detects.
Summary of the invention
Purpose of the present invention can by the described feature of this case in order to the device that detects the one-period signal and in order to detect one-period signal and can finishing by a method with the described feature of this case.
The one-period signal that is contained in the useful signal by detection according to the present invention has a correlation unit with the device that detects described useful signal, in order to proofread and correct a signal, described signal may comprise periodic signal, and will postpone to list between an intersymbol time of described signal and described signal to consider by the symbol with described signal, proofreaied and correct described signal.In addition, described device more comprises an amplitude evaluation unit, in order to estimate the amplitude of described signal.At last, in order to a decision unit of judging whether described periodic signal occurs, be connected in the downstream of described amplitude evaluation unit and described correlation unit.
The one-period signal that is contained in the useful signal by detection according to the present invention presents the following step with the device that detects described useful signal.The consideration that one signal that may comprise periodic signal postpones between listing in for the moment with the symbol of described signal is proofreaied and correct.Estimate the amplitude of described signal.Come the determination cycles signal whether to occur by described amplitude and the signal that during proofreading and correct, obtained.
The development that the present invention has advantage can obtain from the technical characterictic that embodiment described in detail.
According to device of the present invention, described correlation unit may present the unit in order to judge described symbol and to postpone described signal.In addition, described device preferably more comprises a multiplier, one first input of described multiplier is connected in described in order to judge described symbol and the unit that postpones described signal, and one second input of described multiplier is then in order to receive described signal.One first adds up the downstream that the unit is connected in described multiplier.
In a specific embodiment of the present invention, described amplitude evaluation unit presents a unit in order to the absolute value of the real part that forms described signal and the absolute value of imaginary part, and one second adds up the unit and is connected in the downstream.
In another specific embodiment of the present invention, described decision unit presents a multiplier, in order to a predetermined value on the signal times that will be exported by described amplitude evaluation unit, and a comparator, in order to signal of relatively exporting by described correlation unit and the signal of exporting by described multiplier.
In another specific embodiment of the present invention, provide in order to produce a unit of absolute value, make it be connected in the downstream of the described first totalling unit.
In another specific embodiment of the present invention, described in order to the unit that produces absolute value in order to estimate the purpose of absolute value, present one second decision unit.The described second decision unit is construed as the absolute value of estimating the signal of supplying by the described first totalling unit by an evaluation function of definition piecemeal.
According to device of the present invention, can be provided in to be connected to the upstream of the described second decision unit in order to a unit of separation signal.
According to method of the present invention, the symbol of described signal and described signal can be by product and the result that adds the General Logistics Department proofread and correct each other with time delay and the symbol that may be conjugate complex number of described signal and described signal.
In one of method of the present invention preferable specific embodiment, described amplitude be multiplied by a predetermined value and subsequently with described absolute value relatively, whether occur to judge described periodic signal.
Can be used for a WLAN according to apparatus and method preferably of the present invention, particularly according to IEEE 802.11a standard or IEEE 802.11g standard or ETSI TS 101761-1 (BRAN), the WLAN of Hiperlan type 2 standards
Description of drawings
In following explanation, the present invention will be by the mode of specific embodiment, and cooperates the icon that is added to be described in detail, and wherein, the icon that these added is simply described as follows:
One time-histories figure of the assorted letter signal that Fig. 1 represents to assess, wherein signal is superimposed among the described time-histories figure one-period;
Fig. 2 represents the block diagram in order to the possible application of a signal detector of sense cycle signal;
Fig. 3 represents as the outburst of one described in IEEE specifications structure;
Fig. 4 is illustrated in a time-histories figure of the signal during the transmission of training rate sequence preface as shown in Figure 3;
Fig. 5 expresses the signal variation of a signal of input of present signal detector and the correlation variation of described automatic calibration function;
Fig. 6 represents to present an assorted letter composition and appears at the signal variation of a signal of input of described signal detector and the correlation variation of described automatic calibration function;
Fig. 7 represents in contrast to the block diagram of the structure of the signal detector in the prior art;
Fig. 8 represents the block diagram according to the configuration of a signal detector of the present invention; And
Fig. 9 represents to be used for specific embodiment as shown in Figure 8, in order to the allocation plan of the unit that produces absolute value.
Embodiment
Fig. 1 will no longer go through in ensuing specification to the explanation of Fig. 7, but in the relevant list of references for the technical characterictic relevant with the present invention, will be as detailed description as previously described.
According to signal detector of the present invention, as shown in Figure 8, have an input DE, where can apply an input signal s (t), that is can be the plural digital output signal of described analog/digital converter 2.Described input signal s (t) is fed to a unit 21 in order to estimated amplitude, and makes described unit 21 have the signal of mean amplitude of tide value m (t) in its output supply.Simultaneously, described signal s (t) is fed to a correlation unit 24, and the output of described correlation unit 24 is connected to one first input of a decision unit 14.One threshold value thr appears in one second input of described again decision unit 14.One the 3rd input of described again decision unit 14 is connected to described unit 21 in order to estimated amplitude.Can obtain a detection signal d (t) at the output DA of described signal detector, whether detect the one-period signal with concrete expression.
Described correlation unit 24 comprises the unit 17 in order to decision symbol (sign), and this described unit 17 in order to the decision symbol is finished the complex conjugate of the value of symbol that is determined simultaneously.After described unit 17 in order to the decision symbol is a delay cell 10, and described delay cell 10 is in order to τ during signal s (t) is postponed.One multiplier 16 will be by the delayed symbol that described delay cell 10 is exported the above signal s (t) on duty.After described multiplier, be provided with and have the analog adder 11 that increases period T and in order to produce a unit 19 of absolute value.
Thick line on the figure is represented complex signal (two real number signals), and thick dotted line is represented 2 signals (1 signal of two real numbers) of plural number, and fine rule is then represented real number signal.
In order to calculate described correction function c (t), described correlation unit 24 uses following formula:
Or formula:
From mathematics, formula (4) can cause identical result with formula (5), because whether first conjugate complex number portion forms with described symbol subsequently whether determine, or whether described first signal determines whether form with described conjugate complex number portion subsequently, all be unessential.Yet, on practice, carry out formula (5), more detail is in the implementation on VLSI (verylarge scale integration) chip and carry out formula (5), that is described conjugate complex number betides after the sign computation, can compare effectively.
Unlike prior art, the symbol of described input signal s (t) in automatic correction calculation of the present invention to list consideration in.
The symbol of described complex signal s (t), form by following formula:
sgn(x)＝sgn(Re(x))+j·sgn(Im(x)) (6)
Wherein, j represents the imaginary part unit.One of them calculates described automatic calibration function c (t) and has caused following advantage by foregoing formula (4) or formula (5).
Described from the result of dynamic(al) correction and the amplitude irrelevant (therefore also irrelevant) of described inhibit signal composition with the adjustment of described amplifier 1.Described symbol has and is equivalent to a fixing mean amplitude of tide value of 1.Therefore described result from dynamic(al) correction more can not be subjected to the influence at the gain setting of amplifier 1 consumingly.
Another advantage is that needed complex multiplication operation number significantly reduces on the computational discrimination.Complex multiplication operation is represented the multiplying of complex signal.In Fig. 8, represent by the pattern of lines how described calculating is simplified.Described multiplying need have a simple multiplier 16 of in check adder or subtracter form.The 3rd advantage only need to be still less storage device to store the decay part of described input signal s (t).Each sample of signal only needs two storage areas can store the symbol of described signal s (t) eventually.
Because one of them has known fixed amplitude described two signals, be the performance number of the described mean amplitude of tide value m (t) that makes rather than described signal s (t) be used to set described threshold value thr.Described mean amplitude of tide value m (t) can by, the subduplicate method that for example solves the estimated power value p (t) that is determined by equation (2) is calculated.
Yet in order to make the calculating with by simplifying in order to the unit 21 of estimated amplitude of described amplitude m (t), following equation with advantage also can be applied:
In equation (7), all multiplication expression formulas can be avoided, thereby, in the calculating that described equational numeral is carried out, (calculate the absolute value of real part and imaginary part by the unit 20 that forms absolute value, and the add operation of carrying out two absolute values by described contrast adder 6), chip area on the one VLSI chip, and the consumption of power can reduce.Totalling at described analog adder can extend, and for example, surpasses 16 time indexs, has sample time of T=0.8 μ s of the sampling digit rate of 20MHz with correspondence.
Estimation under the basis of dynamic(al) correction c (t), the information whether described estimated amplitude m (t) and fixing threshold value thr (standard of a judgement that will further describe again in the bright book below) provide periodic signal to occur.
Described criterion is:
c(t)≥m(t)*thr (8)
Suppose that promptly described periodic signal takes place if satisfy the condition of inequality (8).If do not satisfy, suppose that then described periodic signal does not also take place.
Described signal detector 3 can be simplified by carry out the absolute value that is produced from described amplitude during automatic correlation unit 24 calculation equations (4) or equation (5).Normal, this needs multiplying and square root.And this situation can be avoided by a function of the amplitude evaluation of definition piecemeal.Therefore, described amplitude is estimated with following equation:
According to equation (9) and piecemeal the function of definition also can be used for solve an equation (7).Under this situation, must be used for replacing described in order to the unit 19 of estimating absolute value in order to produce the unit 20 of absolute value.
Fig. 9 represents the block diagram of correspondence in order to the unit 19 of estimation absolute value.As shown in Figure 8, described unit 19 in order to the estimation absolute value has one in order to separate a unit 22 that is become real part and imaginary part by plus signal cn (t).In addition, if described imaginary part less than 1/4 o'clock of real part, promptly presents the absolute value of described real part in the output of logical circuit 23.Relative, if described real part less than 1/4 o'clock of imaginary part, promptly presents the absolute value of described imaginary part in the output of logical circuit 23.If when being the situation beyond foregoing two situations, 3/4 numerical value of the summation of the absolute value of described real part and the absolute value of imaginary part will be presented on the output of described logical circuit 23.
As from Fig. 8 and Fig. 9 as can be seen, from real part multiplier 7, separate and do not need extra multiplier (because the already mentioned multiplier 16 in front can be in order to estimate described mean amplitude of tide value m (t) and to estimate that a described multiplier via the performed absolute value in unit 19 can fully omit) by the addition/subtraction device of control.Because the reduction of these simplification and storage element, the reduction of the saving of significant chip area and significant power consumption can with significantly relatively come out in as shown in Figure 7 signal detector.
Naturally, specific embodiments of the invention as shown in Figure 8 also can be used for the circuit of Fig. 2.In addition, according to these two foregoing specifications, the present invention also only is not limited to the sense cycle signal.Especially, the present invention also can be used for detecting actual signal.
The element numbers explanation
The amplifier that 1 tool automatically gains and controls
2 analog/digital converters
3 signal detection devices
4 receivers
6 addition computing unit, 5 square operation unit
7 multiplying unit, 8 comparison operation unit
9 conjugate operation units 10 postpone the computing unit
12 absolute value computing unit, 11 addition computing unit
13 power evaluation unit, 14 determining meanss
15 correlation units, 16 multiplying unit
19 signed magnitude arithmetic(al) unit, 17 symbolic operation unit
21 amplitude evaluation unit, 20 signed magnitude arithmetic(al) unit
22 separate real part and imaginary part unit 23 logical circuits
24 correlation units
Claims (15)
1. one kind is included in one-period signal and detect the device of described useful signal in the useful signal by detection, comprises:
One correlation unit (24), with so that may contain a signal s (t) of described periodic signal and be associated with a signal sgn (s (t-τ)), wherein said signal sgn (s (t-τ)) is the symbol of the described signal s (t-τ) that postponed,
One amplitude evaluation unit (21), in order to estimating the amplitude of described signal s (t), and
One decision unit (14) is connected to the downstream of described amplitude evaluation unit (21) and described correlation unit (24), in order to by relatively judging the existence of described periodic signal.
2. device as claimed in claim 1 is characterized in that described correlation unit (24) comprises:
Unit one (17,10), in order to determining described symbol and to postpone described signal s (t),
One multiplier (16), wherein
First input of described multiplier (16) is connected to the downstream of described unit (17,10), with deciding described symbol and be used for postponing described signal s (t), and
Second input of described multiplier receives described signal s (t), and
One first adds up unit (11), is connected in the downstream of described multiplier.
3. device as claimed in claim 2, it is characterized in that described amplitude evaluation unit (21) comprises a unit (20) in order to the absolute value of the absolute value of the real part that forms described signal s (t) and imaginary part, and one second add up unit (6), be connected to described in order to the real part that forms described signal s (t) absolute value and the downstream of the unit (20) of the absolute value of imaginary part.
4. device as claimed in claim 1, wherein said decision unit (14) comprises:
One multiplier (7), in order to a predetermined value on the signal times that will be exported by described amplitude evaluation unit (21), and
One comparator (8) is in order to compare signal of being exported by described correlation unit (24) and the signal of being exported by multiplier (7).
5. device as claimed in claim 3 is characterized in that described correlation unit (24) also comprises the unit (19) that has in order to the generation absolute value, and it is connected in the downstream of the described first totalling unit (11).
6. device as claimed in claim 5, it is characterized in that in described amplitude evaluation unit (21) and in order to the described unit (20) that forms absolute value with and/or be connected in described first and add up the downstream of unit (11) and be to comprise one second decision unit (23) for the purpose of estimating absolute value in order to the described unit (19) that produces absolute value, the described second decision unit (23) is construed as to estimate the absolute value of a suppling signal by the mode of an evaluation function of definition piecemeal.
7. device as claimed in claim 6 is characterized in that in order to a separation signal unit (22) that described suppling signal is separated into real part and imaginary part be the upstream that is connected the described second decision unit (23).
8. arbitrary described device that relates to as claim 1-7, be applied in the WLAN, wherein said WLAN is according to IEEE 802.11a standard or IEEE 802.11g standard or ETSI TS 101 761-1 (BRAN), the WLAN of Hiperlan type2 standard.
One kind by detection be included in the useful signal one-period signal to detect the method for described useful signal, it is characterized in that:
The one signal s (t) that may contain described periodic signal is associated with the delayed symbol of described signal s (t),
Estimate the amplitude m (t) of described signal s (t),
By described amplitude m (t) and during be associated the resulting signal in back make a judgement, whether exist to differentiate described periodic signal.
10. method as claimed in claim 9, it is characterized in that by described signal s (t) is multiplied each other each other with the multiple conjugate value of the delayed symbol of described signal s (t) and with one via the resulting consequential signal addition that is associated, described signal s (t) is associated with the delayed symbol of described signal s (t).
11. method as claimed in claim 10 is characterized in that from by forming an absolute value c (t) the resultant signal cn of addition (t).
12. method as claimed in claim 11 is characterized in that utilizing an evaluation function of definition piecemeal to estimate described absolute value c (t).
13. method as claimed in claim 11 is characterized in that described amplitude m (t) is multiplied by a predetermined value, and is comparing to judge whether described periodic signal exists with described absolute value c (t) subsequently.
14., it is characterized in that described useful signal has signal for useful in a WLAN as the arbitrary described method of claim 9-13.
15. method as claimed in claim 14, it is characterized in that described WLAN is according to IEEE 802.11a standard or IEEE 802.11g standard or ETSI TS 101761-1 (BRAN), the WLAN of Hiperlan type 2 standards.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10245047.1 | 2002-09-26 | ||
| DE2002145047 DE10245047A1 (en) | 2002-09-26 | 2002-09-26 | Device and method for recognizing a useful signal by detecting a periodic signal contained in the useful signal |
| PCT/DE2003/002865 WO2004030268A1 (en) | 2002-09-26 | 2003-08-28 | Device and method for identifying a useful signal by detecting a periodic signal contained in the useful signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1685655A CN1685655A (en) | 2005-10-19 |
| CN1685655B true CN1685655B (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03823100.XA Expired - Fee Related CN1685655B (en) | 2002-09-26 | 2003-08-28 | Device and method for detecting a useful signal by detecting a periodic signal |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1543647B1 (en) |
| CN (1) | CN1685655B (en) |
| DE (2) | DE10245047A1 (en) |
| WO (1) | WO2004030268A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100606050B1 (en) * | 2004-09-17 | 2006-07-28 | 삼성전자주식회사 | Apparatus and method for extracting synchronization in a communication system |
| DE102005006443A1 (en) * | 2005-02-12 | 2006-08-24 | Newlogic Technologies Ag | Preamble detector, for multi-mode receiver, has detecting unit to generate output signal, which indicates type of detected preambles, where detector activates base band functions upon detection of signals containing preambles |
| FR2934102B1 (en) * | 2008-07-18 | 2012-07-20 | Teamcast | METHOD FOR TIME SYNCHRONIZATION OF DIGITAL SIGNAL, CORRESPONDING DEVICE AND COMPUTER PROGRAM PRODUCT |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311315A (en) * | 1992-07-09 | 1994-05-10 | Clarion Co., Ltd. | Ghost detector with time reversal processing |
| CN1196606A (en) * | 1997-02-03 | 1998-10-21 | 株式会社东芝 | Driving control device of synchro and detecting device for A. C. signal |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2419622A1 (en) * | 1978-03-10 | 1979-10-05 | Cit Alcatel | DEVICE FOR MONITORING THE QUALITY OF A SYNCHRONOUS DIGITAL TRANSMISSION SIGNAL |
| RU2055395C1 (en) * | 1992-04-20 | 1996-02-27 | Центральный научно-исследовательский институт "Гранит" | Sign correlation meter |
-
2002
- 2002-09-26 DE DE2002145047 patent/DE10245047A1/en not_active Withdrawn
-
2003
- 2003-08-28 DE DE50310716T patent/DE50310716D1/en not_active Expired - Lifetime
- 2003-08-28 WO PCT/DE2003/002865 patent/WO2004030268A1/en active Application Filing
- 2003-08-28 EP EP03750294A patent/EP1543647B1/en not_active Expired - Fee Related
- 2003-08-28 CN CN03823100.XA patent/CN1685655B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5311315A (en) * | 1992-07-09 | 1994-05-10 | Clarion Co., Ltd. | Ghost detector with time reversal processing |
| CN1196606A (en) * | 1997-02-03 | 1998-10-21 | 株式会社东芝 | Driving control device of synchro and detecting device for A. C. signal |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10245047A1 (en) | 2004-04-08 |
| WO2004030268A1 (en) | 2004-04-08 |
| EP1543647A1 (en) | 2005-06-22 |
| DE50310716D1 (en) | 2008-12-11 |
| EP1543647B1 (en) | 2008-10-29 |
| CN1685655A (en) | 2005-10-19 |
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